Forty-four percent of respondents said they would vote for a generic Democrat in 2020, while one-fifth are still undecided.

Trump's support is roughly in line with other recent polls, and is 10 points lower than former President Obama’s at the same point in his presidency.

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Support for Trump’s reelection fell largely along party lines, with 79 percent of Republicans saying they would vote for Trump and 86 percent of Democrats supporting a Democrat.

According to the poll, a GOP candidate other than Trump would have an even lower chance of election, with 27 percent saying they would support a generic Republican compared to 40 percent supporting a Democrat.

A majority of respondents — 60 percent — said other GOP candidates should challenge Trump in the primaries, though only 38 percent of Republicans agreed.

The poll was conducted between May 17-19 among 1,990 registered voters, and has a margin of error of 2 percentage points.